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Oil pump for filling fluids.

Update...
So I purchased RL Flo-Master 1-Gallon Sprayer weed sprayer from Walmart #001620146 for $10:
http://www.walmart.com/ip/RL-Flo-Master-1-Gallon-Sprayer/13376324

Since diff oil is thick, I took the intake cap orifice of the end of the poly intake tube (that goes into the sprayer bottle), and took the spray wand off too. So you just have the bare black hose to shove into the fill hole. Without wand on, you just pump the bottle up, the diff oil is so heavy and slow flowing, the bottle still pressurizes. I pumped it up 15 times or so, and the fluid starts to move sloooooowly. I walked away, and it slowly pumped out nearly a quart ~ 3 min. Come back, pump 15 times, walk away...another quart flowed into the diff. Repeat as necessary.

You can fill the sprayer bottle to the capacity you need, and it nearly pumps out everything, and I only had about 1 oz in the bottom (I measured) of the sprayer that it didn't suck up.

Conclusion from filling two diffs:
Overall, this thing works great!
No spillage, no waste, no mess, no guessing.
It was the easiest and cleanest diff refill I've experienced.
I'd buy this again.
 
Buy a 5 gallon bucket of gear oil. Get a lid that fits it with the pump built in
 

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